http://www.cnr.it/ontology/cnr/individuo/prodotto/ID52022

Cr[(H3N-(CH2)2-PO3)(Cl)(H2O)] : X-Ray Single-Crystal Structure and Magnetism of a Polar Organic-Inorganic Hybrid Chromium (II) organo-phosphonate. (Articolo in rivista)

Type

Articolo in rivista (Classe)
Prodotto della ricerca (Classe)

Label

Cr[(H3N-(CH2)2-PO3)(Cl)(H2O)] : X-Ray Single-Crystal Structure and Magnetism of a Polar Organic-Inorganic Hybrid Chromium (II) organo-phosphonate. (Articolo in rivista) (literal)

Anno

2003-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

10.1021/ic0343197 (literal)

Alternative label

Bauer E.M., Bellitto C., Colapietro M. Portalone G., Righini G. (2003)
Cr[(H3N-(CH2)2-PO3)(Cl)(H2O)] : X-Ray Single-Crystal Structure and Magnetism of a Polar Organic-Inorganic Hybrid Chromium (II) organo-phosphonate.
in Inorganic chemistry
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Bauer E.M., Bellitto C., Colapietro M. Portalone G., Righini G. (literal)

Pagina inizio

6345 (literal)

Pagina fine

6351 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#altreInformazioni

Il composto di Cr(II) ad alto spin a causa della sua struttura è abbastanza stabile all'aria (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

42 (literal)

Rivista

Inorganic chemistry (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note

http://dx.doi.org/10.1021/ic0343197 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#descrizioneSinteticaDelProdotto

Il composto in esame è stato pubblicato su una delle riviste di Chimica inorganica più importanti del campo. Il solido cristallino è un raro esempio ibrido organico-inorganico bifunzionale: debole ferromagnete e solido polare; L'ordine magnetico a lungo raggio appare a basse temperature. Gli strati inorganici ed organici nel reticolo sono tenutiinsieme da legami ionici ed idrogeno. (literal)

Note

ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

1 CNR ISM 2 Università di Roma \"La Sapienza\" (literal)

Titolo

Cr[(H3N-(CH2)2-PO3)(Cl)(H2O)] : X-Ray Single-Crystal Structure and Magnetism of a Polar Organic-Inorganic Hybrid Chromium (II) organo-phosphonate. (literal)

Abstract

Cr[(H3N-(CH2)2-PO3)(Cl)(H2O)], a rare example of a polar organic-inorganic hybrid material containing Cr2+, was prepared from CrCl2, 2-aminoethyl-phosphonic acid, and urea in water and isolated as light-blue crystals. It crystallizes in the noncentrosymmetric monoclinic space group P21, with a= 5.249(1)Å, b =14.133(3)Å, c= 5.275(1)Å, and beta=105.55(2)°. The inorganic layer of the hybrid network is formed by Cr(II) five-coordinated by three oxygen atoms from the phosphonates and one from the water molecule in a square pyramidal unit, whose apical position is occupied by the Cl- ion. Hydrogen bonds are established between the coordinating water molecule and the oxygen atoms of adjacent phosphonate ligands. The inorganic network is interspersed by ethylammonium groups,and the terminal ammonium moiety is linked to the apical Cl- ions through hydrogen bonds. Electrostatic interactions as well as hydrogen bonds and the coordinated chlorine atoms ensure the cohesion of the 3D structure. The lattice is polar (lack of inversion center), and this fact determines the magnetic behavior of the compound at low temperatures. The magnetic susceptibility data in the temperature range from 300 to 50 K show Curie-Weiss behavior, with C= 2.716 cm3 K mol-1 and the Weiss constant theta= -2.2 K. The corresponding effective magnetic moment of 4.7 BM compares well with the expected value for Cr2+ in d4 high-spin configuration. A slight decrease of the chi*T product versus T observed at temperatures below 50 K indicates nearest-neighbor antiferromagnetic exchange interactions. On cooling below T=6 K, the magnetic susceptibility increases sharply up to a maximum at ca. 5 K and then decreases again. Below T=6 K, hysteresis loops taken at different temperatures show that Cr[(H3N-(CH2)2-PO3)(Cl)(H2O)] behaves as a weak ferromagnet with the critical temperature TN at 5.5 K. The spin canting is responsible of the long-range magnetic ordering. The values of the coercive field, Hc, and of remnant magnetization, Mr, obtained from the hysteresis loop at T = 4.5 K (the lowest measured temperature) are 30 Oe and 0.08 BM, respectively. (literal)

Prodotto di